Well that wont be me then because I believe the basics of what Danny Roddy has written here are correct. Fat burning is a backup system to oxidative metabolism and imo is lower on the evolutionary energy system ladder. Look up the Randle Cycle. Liberating fats (stress, dieting, fasting) or overwhelming the system with dietary fat will cause them to be burned preferentially, and until fatty acid levels are lowered glucose can not be burned or utilised efficiently. This is basically simulating the diabetics broken metabolism.